How to run two dependent function simultaneously?

Hi!

I'm currently trying to solve this problem. A would like to simulate a real time biomedical signal acquisition and make some elaborations on that signal.

In order to do that, I'm using the timer function to feed a biomedical signal (arterial blood pressure previously saved in a my workspace) with a 50Hz frequency.

I can plot that signal as it seems generated in real time.

I would also like to make some elaboration on 60 seconds segments of that signal. It means that I acquire 60 sec of signals, save them in a buffer, and then make the desired elaboration.

The problem is that the elaboration takes more than 1/50 seconds. So I would like to run the elaboration in parallel with data "acquisition". Is there a way to do that?

In other words, I would like to keep acquiring the signal at 50Hz, save 60 seconds of signal in a buffer and then elaborate that buffer, without interrupting signal "acquisition" and visualization.

I will post a segment of explanatory code:

function []=realTimeNew(abp,cbfv)

%%Initialization

persistent buffer;
samplFreq=50;
buffer=60;

%%Create Figure
hFigure=figure(1);
TimerData=timer('TimerFcn', {@realTimeMachine,abp,cbfv},'Period',1/samplFreq,'ExecutionMode','fixedRate','BusyMode','queue','TasksToExecute',length(abp));

start(TimerData);
uiwait(hFigure);
stop(TimerData);

      function realTimeMachine(obj, event,abp,cbfv)

      persistent handlesPlot;
      persistent handlesAx;
      persistent sample;

      % define costants
      displayTime=5;

          if isempty(handlesPlot),
              sample=1;
              handlesAx=subplot(2,1,1);
              subplot(2,1,1);
              handlesPlot=plot(abp(1));
              sample=sample+1;
          else
                OldValues=get(handlesPlot,'YData');
                set(handlesPlot,'YData',[OldValues abp(sample)]);  
                XLimitations=get(handlesAx,'XLim');
                if XLimitations(2)> samplFreq*displayTime,
                    set(handlesAx,'XLim',[XLimitations(2)-samplFreq*displayTime sample]); 
                end
                    if rem(sample,buffer*samplFreq)==0,

                    % elaboration in progress every 60 seconds
                    elaboration();

                    end          

                sample=sample+1;

          end
      end

function []=elaboration()
    pause(1);
end

Answer 1

[Hugo]

Dear Andrea,

you might consider to check the post in

http://www.mathworks.com/matlabcentral/answers/2081-how-to-execute-two-matlab-scripts-simultaneously

There, they suggest using two matlab sessions, and let the scripts talk to each other if necessary (they explain how).

Good luck. Hugo